Model updating is the modification of a numerical model of a structural system such that the response of the modified numerical model becomes consistent with the experimental (real-world) results. In this paper, we have updated the structural model using eigenvalues/vectors sensitivity to get the stiffness parameters for three idealized shear frames of 4, 7, and 10-storey reinforced concrete (RC) frames using limited operational modal data. The model updating is performed varying the damping of the structure (1-5%), no. of modes of the structure (2-3), and no. of measured degree of freedoms (few to all dofs). The result obtained from this operational modal data is compared with the result obtained using modal data obtained from eigenvalue analysis.